Internal-combustion-motor piston



D CAUGHEY INTERNAL COMBUSTION MOTOR PISTON Filed Deb. 20, 1921.

. Q l z 6 I WITNESSES I l/Vl/E/l/TOR QCfll/GHE) A TTOR/VEYS Patented Dec. 2, 1924.

rAvIn CAUGHEY, on NEW YORK, n. Y.

INTERNAL-COMBUSTION-MOTOR rrs'ron.

I Application filed December 20, 1921. Serial No. 523,723.

To all whom it may concern:

- tion motor pistons.

It is one of the objects of the invention to provide a piston inwhich the use of split packing rings may be dispensed with;

It is a further object of the. invention to Q 'constructthe piston so that :a single packing ring of a continuous type'isemployedg It is a further object of the invention to construct the piston so that it is provided ,,with' a plurality of heat-dissipating elemerits.

It: is a further object of the invention to construct the piston so that the heat dissipating elements may be removed if desired.

, With the above and other objects in view, reference is had to the accompanying drawings, in which Figure 1 is a viewin elevation of a piston constructed in accordance with the present invention; I

Fig. 2' is a' horizontal sectional view of the piston, with a portion thereof broken away; f

Fig. 3 is a vertical central sectional view of the piston.

Referring'more particularly to the drawings, the pistonis designated by the reference character 5 and the reference character 6 designates the skirt thereof, which skirt is provided'with the usual wrist pin openfings 7. The body of the piston is cut away as indicated by the reference character 8 to provide a shoulder 9 andmounted on said shoulder 9 and surrounding the piston is. a

. ring 10. The ring 10 is of the continuous type and is positioned on the piston in the following manner:

The ring 10 is heated to extreme temperature at which it is expanded to its limit of expansion, and is then placed. over the cutaway portion 8 of'the piston 5 and forced home into engagement withlthe shoulder 9 thereof. This ring 10 then contracts and is retainedin position upon the piston by said contraction or shrinking. Owingto the extreme temperature to which the ring is heated in placing it upon the piston, it is apparent that the coefiicient of expansion of said ring under the influence of heat is reduced, and that a piston construction formed in accordance with this principle will expand to a lesser degree than one constructed in the ordinary manner.

Extending from the upper face oft-he piston is a projection and said pro'ection is preferablycircular in crosssectionaf form. Carried by the upper face of the piston is a plurality of radially corrugated heat-dissipating plates 16, and interposed with respect to these plates 16 are flat plates 17, there being one flat plate 17 placed between each two corrugated plates 16. The diameter of the corrugated plates 16 and the fiat plates 17 is less than the diameter of the ring 10 as indicated by the reference character 18 in Figs. 1 and 3. These plates are secured in position on the piston 5 by means of a to plate 19, and said top plate is secure in position by means of a screw 20 or the like, engaging an internally threaded recess 21 in the extension 15.

The device functions in the following manner:

When the piston is in the motor cylinder and theexpansion takes place, the force of the explosion is downwardly upon the plate 19 giving the necessary impetus to the piston. As the gases expand they pass around the edge of the plate 19 and into the space between the edges of the plates 16 and 17, where they rush inwardly through the spaces indicated by the reference character and formed by the corrugations of the corrugated plates 16, and the heat is thus trapped within these spaces. By trapping the heat within the spaces it is obvious that the same is held in close contact with the cylindrical walls, thus transferring the heat partly to the greater area of the heat dissipating device and partly to the cylinder walls and thence to the water in the jackets.

From the foregoing it is apparent that the present invention provides a piston for use in internal combustion motors in which the necessity of using split rings, is eliminated, and, at the same time, the construction of the piston permits of the use of a single continuous ring for providing a gas-tight joint between the piston and the walls of the cylinder in which the piston operates. Furthermore, the present invention provides means for dissipating the heat of the charge and thus reduces the heat which the piston attains during Working conditions.

. I claim:

1. In a piston for motors, a main body portion, a continuous ring carried thereby, and a plurality of radially corrugated heatdissipating elements removably carried by said piston and superimposed with respect to said ring.

2. In combination with an internal combustion motor piston, a plurality of radially corrugated heat dissipating elements removably carried thereby, the diameter of said heat-dissipating elements being less than the diameter of the piston.

3. In an internal combustion motor piston, a body portion, a continuous packing ring carried thereby, and heat-dissipating ele-' ments carried above the body portion of the piston and superimposed with respect to said packing ring, substantially as described.

4. In an internal combustion motor piston, a packing rin carried thereby, and heat-dissipating elements of smaller diameter than the piston and removably carried thereby, said heat dissipating elements arranged 1n juxtaposition to said packing ring.

5. In an internal combustion motor piston,

corrugated plates and fiat plates rigidly together to form a unitary structure.

6. In an internal combustion motor piston, a plurality of heat-dissipating devices, said heat-dissipating devices comprising a plurality of radially corrugated plates, fiat plates interposed with respect to said corrugated plates, and means for securing said corrugated plates and flat plates rigidly together to form a unitary structure, said securing means comprising a removable piston head.

7. In an internal combustion motor piston,

a plurality of heat-dissipating devices, said.

heat-dissipating devices comprising a plurality of radially corrugated plates, flat plates interposed with respect to said corrugated plates, and means for securing said corrugated plates and flat plates rigidly together to form a unitary structure, said means comprising a plate and means forsecuring said plate' to the piston, said plate forming the head of said piston.

DAVID CAUGHEY. 

